CSS “overflow” culls “background-color”

问题

I'm trying to style blocks of code for a website. The container div is set to overflow both vertically and horizontally. The problem is when it overflows horizontally, the zebra-striped background-color is culled. I tried it with a background image as well but it culls that too. Why is it doing that and how do I fix it?

Thanks.

Image: http://zero.robotrenegade.com/q3w/background-overflow.png

Webpage (scale your browser width down to see the problem): http://zero.robotrenegade.com/q3w/code.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta name="created" content="">
    <meta name="description" content="">
    <meta name="keywords" content="">
    <link rel="stylesheet" href="" type="text/css" media="all" title="Default styles" />
    <title></title>
    <!--[if IE]><script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script><![endif]-->
    <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
    <script type="text/javascript">
        $(document).ready(function(){
            jQuery("pre code").html(function(index, html) {
                    return html.replace(/^(.*)$/mg, "<span class=\"line\">$1</span>")
            });
        });
    </script>
<style>
.codeblock {
    max-height: 25em;
    overflow: auto;
    margin: 1em;
    border: 1px solid #ccc;
    font-size: 1em;
    line-height: normal;
    border-radius: 8px;
    box-shadow: 0px 0px 4px rgba(0,0,0,0.25);
}
.codeblock h1, .codeblock p {
    font-size: 1em;
    margin: 0;
    padding: 0em 1em 0.5em 3.5em;
    line-height: 2em;
    background-color: #eee;
}
.codeblock pre {
    margin: 0;
    padding: 0;
    font-face: 'lucida console',monaco,courier,'courier new',monospace;
}
.codeblock pre code {
    counter-reset: line-numbering;
    margin: 0;
    padding: 0;
}
.codeblock pre code .line::before {
    content: counter(line-numbering);
    counter-increment: line-numbering;
    padding-right: 0.5em;
    width: 4.5em;
    text-align: right;
    color: #888;
    border-right: 1px dotted #888;
    display: inline-block;
    background-color: #eee;
}
.codeblock pre code .line {
    display: block;
    margin: 0 0 -1.2em 0;
    line-height: 1.5em;
}
.codeblock pre code .line:nth-child(odd) {
    background: #f2f5f9;
}
/*.codeblock pre code .line:hover {
    background: #4b95e5;
    color: #fff;
}*/
</style>

</head>
<body>

<div class="codeblock"><!--<h1>Hello, this is an optional header.</h1>-->
<pre><code>void idAF::Restore( idRestoreGame *savefile ) {
    savefile->ReadObject( reinterpret_cast<idClass *&>( self ) );
    savefile->ReadString( name );
    savefile->ReadBool( hasBindConstraints );
    savefile->ReadVec3( baseOrigin );
    savefile->ReadMat3( baseAxis );
    savefile->ReadInt( poseTime );
    savefile->ReadInt( restStartTime );
    savefile->ReadBool( isLoaded );
    savefile->ReadBool( isActive );

    animator = NULL;
    modifiedAnim = 0;

    if ( self ) {
        SetAnimator( self->GetAnimator() );
        Load( self, name );
        if ( hasBindConstraints ) {
            AddBindConstraints();
        }
    }

    savefile->ReadStaticObject( physicsObj );

    if ( self ) {
        if ( isActive ) {
            // clear all animations
            animator->ClearAllAnims( gameLocal.time, 0 );
            animator->ClearAllJoints();

            // switch to articulated figure physics
            self->RestorePhysics( &physicsObj );
            physicsObj.EnableClip();
        }
        UpdateAnimation();
    }
}</code></pre>
<!-- <p>This is an optional footer, goodbye!</p> -->
</div>

</body>
</html>

回答1:

Try float:left on the .codeblock pre. Works in Firefox.

<pre> fits itself inside the .codeblock container like there was no more room. float makes your <pre> element wide just enough to fit its content.

UPDATE

.codeblock pre {
    float: left;
    min-width: 100%;}

Works in Firefox, Opera, IE9 and WebKit

As far as I understand, it elements inside a container with overflow:auto fit themselves inside the area that's visible by default. Those elements' width:100% is only as wide as the outer container. In this example inside of the inner container you have a code tag that doesn't break lines so the text goes outside the inner container and makes the outer container show scrolls. To avoid that, you need the inner container to fit its content hence float:left.

But, as you cleverly noticed (and I didn't), this way it won't expand if the outer container is wider than the code so to avoid that you need to put min-width:100% to make the inner container use at least all the visible space inside the outer container.

回答2:

Lines are expanding like every block element to the maximum width - and that is without overflow. And they are not connected - if one is bigger, it does not affect others.

Try changing them to something else than block element, like that:

.codeblock pre code .line {
    display: table-row;
}

Table-related types change width or height (cells) together

http://jsfiddle.net/D7rND/

回答3:

Try:

.codeblock pre, .codeblock pre code {
  display: inline-block;
}

This worked for me in Safari.

回答4:

Use a proper DTD format.it's good on firefox though...

回答5:

I just added {float:left} to the div's whose backgrounds were being "culled" in my situation.

With this change the backgrounds and borders would extend with the overflowed text. So as I scroll horizontally the text is displayed uniformly with the same background and borders.

Before adding this piece of css, the background/border would not overflow beyond div, although the text would.

来源：https://stackoverflow.com/questions/8513099/css-overflow-culls-background-color

标签

html

css

background

overflow